Thought I'd move the PS pump conversation back over to the 6.5 forum.
Weather was pretty good, this afternoon (for a while), so, I fired up the Burb and waited for it to warm for ~2 minutes, or so. Took off, down Eagles Flight, still running the cold-start advance. I used to have a timer on it, but it conked out on me. I ordered a new one, modified the case to fit, just like the old one, and, the doggone thing wouldn't even light up, so I canned it and went back to the toggle. Anyhow, I can get up to 2nd, even 3rd, on EF, and it'll run up to 2000 rpm. The whine was totally absent!ν Ύν΄” Got closer to the intersection(.3 miles) of EF and Dry Gulch, and, here comes the whine, gradually increasing. So, I cancelled my plan to turn around and go back and celebrate; turned left, up Dry Gulch Hill and the whine worsened as we climbed out. So, I drove out to Bourden Ranch Road, took a right and drove to Shumway Road and turned around and came home. Wherever I got the chance, I kept on the throttle, to maintain 1500 and exercised the steering and brakes. The brakes definitely change the pitch of the whine, though by only a bit. Both steering and brakes work flawlessly, except that I can actually feel the resonance in the wheel.

After I got back, I grabbed a piece of heater hose and had Jean run the throttle. Incidently, the whine can be heard at idle, but, barely, and it doesn't increase until 1000-1100 rpm. Gets the loudest at 1500. At idle, through the hose, I couldn't tell what I was hearing, but when she took it up past 1000, there was a very high frequency noise that I perceived as having (maybe) the same pitch as in the cabin, but was the result of having my ear right on the steel surface. I checked a lot of areas, and was surprised at how quiet the valve covers engine block and the intake system were. Very hard to tell about the vacuum pump and AC, because the cooling fan moves so much air on that side, near the shroud opening. Oh! The turbo seems to make next to zero noise, through the hose.

So, here we are. I'll probably take the time to remove the serp belt and give her a quick run, out Eagles Flight and back, maybe turn around as soon as I hit 1500 rpm. Must remember to warm it up, though, before I pull the belt, if it's gonna continue to run silent, cold.

I mention these roads, kinda hopin y'all might stop in.😁 Just remember; EF and Dry Gulch are just two of the 4 that comprise the "Goat Path" to Bourdon Ranch. The other two are Conastoga and High Plains. And, more than likely, if you follow a GPS, to 8480 Eagles Flight, from Bourdon Ranch, mile marker 10, it'll take you right past Conestoga and all the way up to the other end of Eagles Flight and direct (dump) you onto a stretch of the Goat Path that you won't want your Vette within 5 miles of. Matter of fact, beyond Conestoga (.2 MI from BR -- mm10, left), the next 3-4 miles would permanently modify a Vette's whole undercarriage. Stop in, any time.